blob: 53a10738732d8aee6d5a602afa96b0d527aa76c9 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <map>
#include <set>
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
#include "media/audio/fake_audio_consumer.h"
#include "media/base/audio_converter.h"
namespace base {
class MessageLoopProxy;
namespace media {
class LoopbackAudioConverter;
class VirtualAudioOutputStream;
// VirtualAudioInputStream converts and mixes audio from attached
// VirtualAudioOutputStreams into a single stream. It will continuously render
// audio until this VirtualAudioInputStream is stopped and closed.
class MEDIA_EXPORT VirtualAudioInputStream : public AudioInputStream {
// Callback invoked just after VirtualAudioInputStream is closed.
typedef base::Callback<void(VirtualAudioInputStream* vais)>
// Construct a target for audio loopback which mixes multiple data streams
// into a single stream having the given |params|. |worker_loop| is the loop
// on which AudioInputCallback methods are called and may or may not be the
// single thread that invokes the AudioInputStream methods.
const AudioParameters& params,
const scoped_refptr<base::MessageLoopProxy>& worker_loop,
const AfterCloseCallback& after_close_cb);
virtual ~VirtualAudioInputStream();
// AudioInputStream:
virtual bool Open() OVERRIDE;
virtual void Start(AudioInputCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Close() OVERRIDE;
virtual double GetMaxVolume() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual double GetVolume() OVERRIDE;
virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
virtual bool GetAutomaticGainControl() OVERRIDE;
// Attaches a VirtualAudioOutputStream to be used as input. This
// VirtualAudioInputStream must outlive all attached streams, so any attached
// stream must be closed (which causes a detach) before
// VirtualAudioInputStream is destroyed.
virtual void AddOutputStream(VirtualAudioOutputStream* stream,
const AudioParameters& output_params);
// Detaches a VirtualAudioOutputStream and removes it as input.
virtual void RemoveOutputStream(VirtualAudioOutputStream* stream,
const AudioParameters& output_params);
friend class VirtualAudioInputStreamTest;
typedef std::map<AudioParameters, LoopbackAudioConverter*> AudioConvertersMap;
// Pulls audio data from all attached VirtualAudioOutputStreams, mixes and
// converts the streams into one, and pushes the result to |callback_|.
// Invoked on the worker thread.
void PumpAudio(AudioBus* audio_bus);
const scoped_refptr<base::MessageLoopProxy> worker_loop_;
AfterCloseCallback after_close_cb_;
AudioInputCallback* callback_;
// Non-const for testing.
scoped_ptr<uint8[]> buffer_;
AudioParameters params_;
// Guards concurrent access to the converter network: converters_, mixer_, and
// num_attached_output_streams_.
base::Lock converter_network_lock_;
// AudioConverters associated with the attached VirtualAudioOutputStreams,
// partitioned by common AudioParameters.
AudioConvertersMap converters_;
// AudioConverter that takes all the audio converters and mixes them into one
// final audio stream.
AudioConverter mixer_;
// Number of currently attached VirtualAudioOutputStreams.
int num_attached_output_streams_;
// Handles callback timing for consumption of audio data.
FakeAudioConsumer fake_consumer_;
base::ThreadChecker thread_checker_;
} // namespace media